CN111925684A - Radar wave-absorbing material and preparation method thereof - Google Patents

Radar wave-absorbing material and preparation method thereof Download PDF

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Publication number
CN111925684A
CN111925684A CN202010807269.6A CN202010807269A CN111925684A CN 111925684 A CN111925684 A CN 111925684A CN 202010807269 A CN202010807269 A CN 202010807269A CN 111925684 A CN111925684 A CN 111925684A
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epoxy resin
absorbing material
modified epoxy
resin
agent
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CN111925684B (en
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罗振涛
王浩继
丁铁伢
王建国
程文
甘丹
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Aerospace Science And Industry Wuhan Magnetism Electron Co ltd
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Aerospace Science And Industry Wuhan Magnetism Electron Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/32—Radiation-absorbing paints
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend

Abstract

The invention provides a radar wave-absorbing material and a preparation method thereof, wherein the radar wave-absorbing material comprises an electromagnetic wave absorbent, resin and a curing agent, wherein the resin comprises epoxy resin and modified epoxy resin, and the modified epoxy resin comprises one or more of rubber modified epoxy resin, polyurethane modified epoxy resin and polyacrylate modified epoxy resin; wherein the glass transition temperature (T) of the modified epoxy resing) Less than-50 ℃. The radar wave-absorbing material of the invention is prepared by mixing TgThe complex system composed of lower modified epoxy resin and traditional epoxy resin is used as the matrix substance of the wave-absorbing coating material, and the modified epoxy resin has lower TgAfter curing, a two-phase structure is formed, the rubber phase is formedThe micro-area has double functions of starting and stopping the silver streak, and the flexibility of the coating is improved.

Description

Radar wave-absorbing material and preparation method thereof
Technical Field
The invention relates to the technical field of wave-absorbing coatings, in particular to a radar wave-absorbing material and a preparation method thereof.
Background
Stealth technology has become the key technology of modern war, and its realization method mainly is appearance stealth and material stealth two kinds. The appearance stealth technology is difficult, the structural performance of a target is easy to degrade, and the stealth material technology is simple and easy to implement. The radar wave-absorbing coating has the advantages of simple process, adjustable performance, convenient construction, no limitation of the shape of a workpiece and the like, and becomes one of the main research directions of stealth material technology.
At present, resin matrixes commonly used in radar wave-absorbing coatings, such as chlorosulfonated polyethylene, polyurethane, epoxy resin and the like, have contradictions between high flexibility and high strength, and between high flexibility and high filling amount, and are difficult to meet the comprehensive mechanical property requirements of high filling amount, high flexibility and high adhesive force at the same time. Compared with other two resins, the epoxy resin has better compatibility with the electromagnetic wave absorbent, and the filling amount of the electromagnetic wave absorbent is high, so that the prepared coating can be cured at normal temperature. However, the coating material also has the defects of poor coating flexibility, brittleness, easy peeling and the like caused by high crosslinking density and large internal stress after curing.
Based on the defects of the existing wave-absorbing materials, the existing wave-absorbing materials need to be improved.
Disclosure of Invention
In view of the above, the invention provides a radar wave-absorbing material and a preparation method thereof, so as to solve the technical problem that the existing wave-absorbing material is poor in flexibility.
In a first aspect, the invention provides a radar wave-absorbing material, which comprises an electromagnetic wave absorbent, resin and a curing agent, wherein the resin comprises epoxy resin and modified epoxy resin, and the modified epoxy resin comprises one or more of rubber modified epoxy resin, polyurethane modified epoxy resin and polyacrylate modified epoxy resin;
wherein, T of the modified epoxy resingLess than-50 ℃.
Optionally, the electromagnetic wave absorbent includes one or more of carbonyl iron powder, alloy powder, ferrite, barium titanate, silicon carbide, carbon black, graphene, and polyaniline.
Optionally, the alloy powder includes one or more of fesicrir alloy powder, FeSiNi alloy powder and FeCrNi alloy powder.
Optionally, the curing agent comprises one or more of GR701, D400, NX-2040, MH-112, MH-204, PACM, DMDC, T-31
Optionally, the solvent further comprises a diluent, wherein the diluent comprises one or more of xylene, cyclohexanone, butanone, n-butanol and butyl acetate.
Optionally, the paint also comprises a leveling agent, wherein the leveling agent comprises one or more of BYK-333, BYK-306, TEGO450, DN-2757 and KYC-616.
Optionally, the anti-settling agent is further included, and the anti-settling agent comprises one or more of BYK-410, BYK-425, DH-6900, MT-6650 and SP-912.
Optionally, the defoaming agent also comprises defoaming agent, wherein the defoaming agent comprises one or more of MH-2081, JQ-605, DL-1175, F-2594, DE-0965 and DL-3562.
Optionally, the weight percentages of the electromagnetic wave absorbent, the resin, the diluent, the curing agent, the leveling agent, the anti-settling agent and the defoaming agent are respectively 55-70%, 10-15%, 15-25%, 1-2%, 0.5-1% and 0.5-1%; wherein the mass fraction of the modified epoxy resin in the resin is 40-90%.
In a second aspect, the invention also provides a preparation method of the radar wave-absorbing material, which comprises the following steps:
adding the electromagnetic wave absorbent into absolute ethyl alcohol for uniform dispersion, then adding a silane coupling agent for embedding treatment, and filtering to obtain a pretreated electromagnetic wave absorbent;
dissolving resin in the optional diluent, then adding the pretreated electromagnetic wave absorbent, the optional leveling agent, the optional anti-settling agent and the optional defoaming agent, stirring uniformly, then adding the curing agent, and continuously stirring uniformly to obtain the radar absorbing material.
Compared with the prior art, the wave-absorbing material for the land radar has the following beneficial effects:
(1) the radar wave-absorbing material of the invention is prepared by mixing TgThe compound system of modified epoxy resin with the temperature lower than-50 ℃ and the traditional epoxy resin is used as the matrix substance of the wave-absorbing coating material, and the modified epoxy resin has lower TgAfter curing, a two-phase structure is formed, and a micro-area formed by the rubber phase has double functions of initiating and stopping silver streaks, so that the flexibility of the coating is improved;
(2) according to the radar wave-absorbing material, the adhesive force and the elongation at break of the coating are improved by controlling the content of the modified epoxy resin in the resin, and tests show that when the consumption of the modified epoxy resin is 80%, the elongation at break of the coating is 238.6%, the adhesive force is 19.7MPa, and the use requirements are met;
(3) according to the radar wave-absorbing material, a certain amount of electromagnetic wave absorbent is added into a compound resin system, when a coating is acted by external force, microcracks are generated between particles and a matrix to absorb energy, the toughening and reinforcing effects are achieved, and tests show that when the addition amount of the electromagnetic wave absorbent is 65%, the elongation at break and the adhesive force of the coating are maximum.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a graph showing the effect of the amount of the electromagnetic wave absorber added on the elongation at break of the coating according to the present invention;
FIG. 2 is a graph showing the effect of the amount of the electromagnetic wave absorbent of the present invention on the adhesion of a coating layer;
FIG. 3 is a graph showing the effect of the amount of modified epoxy resin added according to the present invention on the elongation at break of the coating;
FIG. 4 is a graph showing the effect of the amount of modified epoxy resin added on the adhesion of a coating according to the present invention;
fig. 5 is a sectional SEM image of a coating layer formed by the radar-absorbing material prepared in examples 5 and 8 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
A radar wave-absorbing material comprises the following raw materials in percentage by weight:
resin: 15%, electromagnetic wave absorber: 55%, diluent: 25.4%, curing agent: 1.8% of leveling agent: 1% and anti-settling agent: 0.8%, defoamer: 1 percent; wherein the resin comprises epoxy resin and modified epoxy resin, and the modified epoxy resin accounts for 80% of the total weight of the resin.
In the embodiment of the present application, the epoxy resin can be selected from conventional epoxy resins such as E-44, E-42, E-39-D, E-35, E-31, E-21, E51, etc.; the modified epoxy resin is one or more of rubber modified epoxy resin, polyurethane modified epoxy resin and polyacrylate modified epoxy resin, specifically, the modified epoxy resin in the embodiment of the application is rubber modified epoxy resin, such as EPP-175, NM-6168, NBR-1704, YS-616, ES-1001N, ES-1023, and the like, and T of the modified epoxy resingLess than-50 ℃.
In the embodiment of the application, the electromagnetic wave absorbent can be one or more of carbonyl iron powder, alloy powder, ferrite, barium titanate, silicon carbide, carbon black, graphene and polyaniline; wherein the grain size of the carbonyl iron powder can be 4-5 μm, 6-7 μm, 9-10 μm or 11-12 μm, and the alloy powder can be one or more of FeSiCr alloy powder, FeSiNi alloy powder and FeCrNi alloy powder; in the embodiment of the application, carbonyl iron powder is selected as the electromagnetic wave absorbent.
In the embodiment of the application, the diluent is a liquid solvent which is added with good miscibility with the resin and is used for reducing the viscosity of the resin and improving the process performance of the resin. The diluent can adopt one or more of dimethylbenzene, cyclohexanone, butanone, n-butanol and butyl acetate, and the diluent adopts dimethylbenzene in the embodiment of the application.
In the embodiment of the application, the curing agent is a substance or a mixture for promoting or controlling the curing reaction, the resin curing is a chemical reaction such as condensation, ring closure, addition or catalysis, so that the thermosetting resin generates an irreversible change process, and the curing is completed by adding the curing agent; the curing agent is one or more of GR701, D400, NX-2040, MH-112, MH-204, PACM, DMDC and T-31, and particularly, in the embodiment of the application, the curing agent is GR 701.
In the embodiment of the application, the leveling agent is a common paint auxiliary agent and can promote the paint to form a flat, smooth and uniform coating film in the drying film-forming process; the leveling agent can adopt one or more of BYK-333, BYK-306, TEGO450, DN-2757 and KYC-616, and concretely, in the embodiment, BYK-333 is adopted as the leveling agent.
In the embodiment of the application, the anti-settling agent can change the rheological property of the coating and avoid the settling of all components uniformly mixed in the coating; the anti-settling agent is one or more of BYK-410, BYK-425, DH-6900, MT-6650 and SP-912, and specifically, in the embodiment of the application, the anti-settling agent is BYK-410.
In the embodiment of the application, the defoaming agent can eliminate foam in the coating system, the defoaming agent is one or more of MH-2081, JQ-605, DL-1175, F-2594, DE-0965 and DL-3562, and particularly, the defoaming agent is MH-2081 in the embodiment of the application.
Based on the same inventive concept, the embodiment of the application also provides a preparation method of the radar wave-absorbing material, which comprises the following steps:
s1, adding the electromagnetic wave absorbent into absolute ethyl alcohol for dispersion, gradually adjusting the stirring speed from 800r/min to 3000r/min, and dispersing for 60min at the rotating speed; then adding a silane coupling agent for high-speed dispersion coating treatment for 120 min; finally standing for 15min, removing supernatant, washing the lower-layer solid for 2-3 times by using absolute ethyl alcohol, and drying and screening to obtain the pretreated electromagnetic wave absorbent;
and S2, dissolving the resin in a diluent, adding the pretreated electromagnetic wave absorbent, the leveling agent, the anti-settling agent and the defoaming agent, fully and uniformly mixing in a homogenizing and emulsifying machine, finally adding the curing agent, continuously dispersing for 15min, filtering and discharging to obtain the radar wave absorbing coating.
In the examples of the present application, KH550 is used as the silane coupling agent;
when the radar wave-absorbing material prepared in the embodiment of the application is applied, the wave-absorbing coating is uniformly sprayed on a substrate plate with a clean surface at room temperature according to a certain speed by using a lower kettle spray gun, the feeding amount and the spraying time interval of each spraying are strictly controlled until the spraying is finished, after the spraying is finished, a sample piece is firstly placed at 50 ℃ for curing for 2 hours, then is continuously cured for 20 hours at 80 ℃, and is naturally cooled and taken out for later use.
Example 2
The difference from the example 1 is that the radar wave-absorbing material comprises the following raw materials in percentage by weight:
resin: 15%, electromagnetic wave absorber: 60%, diluent: 20.4%, curing agent: 1.8% of leveling agent: 1% and anti-settling agent: 0.8%, defoamer: 1 percent; wherein the resin comprises epoxy resin and modified epoxy resin, and the modified epoxy resin accounts for 80% of the total weight of the resin.
Example 3
The difference from the example 1 is that the radar wave-absorbing material comprises the following raw materials in percentage by weight:
resin: 13%, electromagnetic wave absorber: 65% of diluent: 18.6%, curing agent: 1.4% and leveling agent: 0.5%, anti-settling agent: 1% of defoaming agent: 0.5 percent; wherein the resin comprises epoxy resin and modified epoxy resin, and the modified epoxy resin accounts for 80% of the total weight of the resin.
Example 4
The difference from the example 1 is that the radar wave-absorbing material comprises the following raw materials in percentage by weight:
resin: 10%, electromagnetic wave absorber: 70% and diluent: 15.4%, curing agent: 1.8% of leveling agent: 1% and anti-settling agent: 0.8%, defoamer: 1 percent; wherein the resin comprises epoxy resin and modified epoxy resin, and the modified epoxy resin accounts for 80% of the total weight of the resin.
Example 5
A radar wave-absorbing material comprises the following raw materials in percentage by weight:
resin: 13%, electromagnetic wave absorber: 65% of diluent: 18.6%, curing agent: 1.4% and leveling agent: 0.5%, anti-settling agent: 1% of defoaming agent: 0.5 percent; the resin comprises epoxy resin and modified epoxy resin, wherein the modified epoxy resin accounts for 50% of the total weight of the resin.
In the embodiment of the present application, the epoxy resin can be selected from conventional epoxy resins such as E-44, E-42, E-39-D, E-35, E-31, E-21, E51, etc.; the modified epoxy resin is one or more of rubber modified epoxy resin, polyurethane modified epoxy resin and polyacrylate modified epoxy resin, specifically, in the embodiment of the application, the modified epoxy resin is polyurethane modified epoxy resin, which can be selected from UA10, UA11, GH-100, 102C-3, EPU-73B, EPU-300A, EPU-301 and the like, and T of the modified epoxy resin is T of the modified epoxy resingLess than-50 ℃.
In the embodiment of the application, the electromagnetic wave absorbent can be one or more of carbonyl iron powder, alloy powder, ferrite, barium titanate, silicon carbide, carbon black, graphene and polyaniline; wherein the grain size of the carbonyl iron powder can be 4-5 μm, 6-7 μm, 9-10 μm or 11-12 μm, and the alloy powder can be one or more of FeSiCr alloy powder, FeSiNi alloy powder and FeCrNi alloy powder; in the embodiment of the present application, the electromagnetic wave absorbent is made of alloy powder.
In the embodiment of the application, the diluent is a liquid solvent which is added with good miscibility with the resin and is used for reducing the viscosity of the resin and improving the process performance of the resin. The diluent can adopt one or more of dimethylbenzene, cyclohexanone, butanone, n-butanol and butyl acetate, and in the embodiment of the application, the diluent adopts dimethylbenzene and cyclohexanone.
In the embodiment of the application, the curing agent is a substance or a mixture for promoting or controlling the curing reaction, the resin curing is a chemical reaction such as condensation, ring closure, addition or catalysis, so that the thermosetting resin generates an irreversible change process, and the curing is completed by adding the curing agent; the curing agent is one or more of GR701, D400, NX-2040, MH-112, MH-204, PACM, DMDC and T-31, and specifically, in the embodiment of the application, the curing agent is compounded by two of D400 and NX-2040.
In the embodiment of the application, the leveling agent is a common paint auxiliary agent and can promote the paint to form a flat, smooth and uniform coating film in the drying film-forming process; the leveling agent can adopt one or more of BYK-333, BYK-306, TEGO450, DN-2757 and KYC-616, and concretely, in the embodiment, the leveling agent adopts BYK-306.
In the embodiment of the application, the anti-settling agent can change the rheological property of the coating and avoid the settling of all components uniformly mixed in the coating; the anti-settling agent is one or more of BYK-410, BYK-425, DH-6900, MT-6650 and SP-912, and specifically, in the embodiment of the application, the anti-settling agent is DH-6900.
In the embodiment of the application, the defoaming agent can eliminate foam in the coating system, the defoaming agent is one or more of MH-2081, JQ-605, DL-1175, F-2594, DE-0965 and DL-3562, and in the embodiment of the application, JQ-605 is used as the defoaming agent.
Based on the same inventive concept, the embodiment of the application also provides a preparation method of the radar wave-absorbing material, which comprises the following steps:
s1, adding the electromagnetic wave absorbent into the absolute ethyl alcohol for dispersion, gradually adjusting the stirring speed from 800r/min to 3000r/min, and dispersing for 60min at the rotating speed; then adding a silane coupling agent for high-speed dispersion coating treatment for 120 min; finally standing for 15min, removing supernatant, washing the lower-layer solid for 2-3 times by using absolute ethyl alcohol, and drying and screening to obtain the pretreated electromagnetic wave absorbent;
and S2, dissolving the resin in a diluent, adding the pretreated electromagnetic wave absorbent, the leveling agent, the anti-settling agent and the defoaming agent, fully and uniformly mixing in a homogenizing and emulsifying machine, finally adding the curing agent, continuously dispersing for 15min, filtering and discharging to obtain the radar wave absorbing coating.
In the examples of the present application, KH550 is used as the silane coupling agent;
when the radar wave-absorbing material prepared in the embodiment of the application is applied, the wave-absorbing coating is uniformly sprayed on a substrate plate with a clean surface at room temperature according to a certain speed by using a lower kettle spray gun, the feeding amount and the spraying time interval of each spraying are strictly controlled until the spraying is finished, after the spraying is finished, a sample piece is firstly placed at 50 ℃ for curing for 2 hours, then is continuously cured for 20 hours at 80 ℃, and is naturally cooled and taken out for later use.
Example 6
The difference from example 5 is that the modified epoxy resin in the resin accounts for 60% of the total resin.
Example 7
The difference from example 5 is that the modified epoxy resin in the resin accounts for 70% of the total resin.
Example 8
The difference from example 5 is that the modified epoxy resin contained in the resin was 80% of the total amount of the resin.
Example 9
The difference from example 5 is that the modified epoxy resin contained in the resin was 90% of the total resin.
The radar absorbing material prepared in the above embodiments 1 to 9 is subjected to a coating tensile property (elongation at break) test and a coating adhesion test, and the test results are respectively shown in fig. 1 to 4, wherein the coating tensile property (elongation at break) test is performed according to the specification of GB/T528-.
FIG. 5 shows SEM images of cross sections of coatings formed by curing the radar-absorbing material prepared in different embodiments, wherein A is the SEM image of the cross section of the coating formed by the radar-absorbing material prepared in embodiment 5; and B is a cross-sectional SEM image of a coating formed by the radar absorbing material prepared in the example 8.
Fig. 1 shows the influence of the addition amount of carbonyl iron powder of different electromagnetic wave absorbers on the elongation at break of the wave-absorbing material, and it can be seen from fig. 1 that when the addition amount of carbonyl iron powder of the electromagnetic wave absorber is 65%, the wave-absorbing material has the maximum elongation at break, and the elongation at break is 215.5%; FIG. 2 shows the influence of the addition amounts of carbonyl iron powder of different electromagnetic wave absorbers on the adhesion of the wave-absorbing material, and it can be seen from FIG. 2 that the wave-absorbing material has the maximum adhesion when the addition amount of carbonyl iron powder of the electromagnetic wave absorber is 65%, and the adhesion is 18.8 MPa; fig. 3 shows the influence of the content of the modified epoxy resin in the resin on the elongation at break of the wave-absorbing material, and it can be seen from fig. 3 that when the addition amount of the modified epoxy resin in the resin is 80%, the wave-absorbing material has the maximum elongation at break, and the elongation at break is 238.6%; fig. 4 shows the influence of the addition amount of the modified epoxy resin in the resin on the adhesive force of the wave-absorbing material, and it can be seen from fig. 4 that when the addition amount of the modified epoxy resin in the resin is 80%, the wave-absorbing material still has high adhesive force, and the adhesive force is 19.7 MPa.
From the above, when the addition amount of the resin is 13%, the addition amount of the modified epoxy resin accounts for 80% of the total amount of the resin, and the addition amount of the electromagnetic wave absorbent is 65%, the radar wave absorbing material prepared by the method has the breaking elongation of more than 215% and the adhesive force of more than 18 MPa. As can be seen from FIG. 5, the modified epoxy resin is added to the conventional epoxy resin system because the modified epoxy resin has a lower TgAnd a two-phase structure is formed after curing, and a micro-area formed by the rubber phase has the dual functions of initiating and stopping the silver lines, so that the flexibility of the coating is improved, but the adhesive force of the coating is reduced due to the reduction of the content of small-component traditional epoxy resin. Meanwhile, a certain amount of electromagnetic wave absorber is added into a compound resin systemWhen the coating is acted by external force, micro-cracks are generated between the particles and the matrix to absorb energy, the toughening and reinforcing effects are achieved, and when the addition amount of the electromagnetic wave absorbent is 65%, the effect is optimal.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. A radar wave-absorbing material is characterized by comprising an electromagnetic wave absorbent, resin and a curing agent, wherein the resin comprises epoxy resin and modified epoxy resin, and the modified epoxy resin comprises one or more of rubber modified epoxy resin, polyurethane modified epoxy resin and polyacrylate modified epoxy resin;
wherein, T of the modified epoxy resingLess than-50 ℃.
2. The radar absorbing material of claim 1, wherein the electromagnetic wave absorber comprises one or more of carbonyl iron powder, alloy powder, ferrite, barium titanate, silicon carbide, carbon black, graphene, and polyaniline.
3. The radar absorbing material of claim 2, wherein the alloy powder comprises one or more of FeSiCr alloy powder, FeSiNi alloy powder, and FeCrNi alloy powder.
4. The radar absorbing material of claim 1, wherein the curing agent comprises one or more of GR701, D400, NX-2040, MH-112, MH-204, PACM, DMDC, T-31.
5. The radar absorbing material of claim 1 further comprising a diluent comprising one or more of xylene, cyclohexanone, butanone, n-butanol, butyl acetate.
6. The radar absorbing material of claim 5, further comprising a leveling agent, wherein the leveling agent comprises one or more of BYK-333, BYK-306, TEGO450, DN-2757, KYC-616.
7. The radar absorbing material of claim 6 further comprising an anti-settling agent comprising one or more of BYK-410, BYK-425, DH-6900, MT-6650, SP-912.
8. The radar absorbing material of claim 7, further comprising an antifoaming agent comprising one or more of MH-2081, JQ-605, DL-1175, F-2594, DE-0965, DL-3562.
9. The radar absorbing material of claim 8, wherein the weight percentages of the electromagnetic wave absorbent, the resin, the diluent, the curing agent, the leveling agent, the anti-settling agent and the defoaming agent are 55-70%, 10-15%, 15-25%, 1-2%, 0.5-1% and 0.5-1%, respectively; wherein the mass fraction of the modified epoxy resin in the resin is 40-90%.
10. A preparation method of the radar wave absorbing material as claimed in any one of claims 1 to 9, wherein the method comprises the following steps:
adding the electromagnetic wave absorbent into absolute ethyl alcohol for uniform dispersion, then adding a silane coupling agent for embedding treatment, and filtering to obtain a pretreated electromagnetic wave absorbent;
dissolving resin in the optional diluent, then adding the pretreated electromagnetic wave absorbent, the optional leveling agent, the optional anti-settling agent and the optional defoaming agent, stirring uniformly, then adding the curing agent, and continuously stirring uniformly to obtain the radar absorbing material.
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CN113754346A (en) * 2021-08-26 2021-12-07 天诺光电材料股份有限公司 Radar stealth board surface damage repair material and repair method
CN114032005A (en) * 2021-11-30 2022-02-11 航天科工武汉磁电有限责任公司 Corrosion-resistant low-frequency wave-absorbing coating and preparation method thereof
CN115873440A (en) * 2022-10-31 2023-03-31 航天科工武汉磁电有限责任公司 High-temperature-resistant wave-absorbing coating and preparation method thereof, broadband wave-absorbing material and preparation method thereof
CN116515387A (en) * 2022-10-12 2023-08-01 中国航发北京航空材料研究院 Low-internal-stress high-weather-resistance wave-absorbing coating and preparation method thereof

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CN112863845A (en) * 2021-01-08 2021-05-28 电子科技大学 Preparation method of crosslinked resin coated flaky carbonyl iron powder
CN113754346A (en) * 2021-08-26 2021-12-07 天诺光电材料股份有限公司 Radar stealth board surface damage repair material and repair method
CN114032005A (en) * 2021-11-30 2022-02-11 航天科工武汉磁电有限责任公司 Corrosion-resistant low-frequency wave-absorbing coating and preparation method thereof
CN116515387A (en) * 2022-10-12 2023-08-01 中国航发北京航空材料研究院 Low-internal-stress high-weather-resistance wave-absorbing coating and preparation method thereof
CN115873440A (en) * 2022-10-31 2023-03-31 航天科工武汉磁电有限责任公司 High-temperature-resistant wave-absorbing coating and preparation method thereof, broadband wave-absorbing material and preparation method thereof

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